1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
use std::hash::{Hash, Hasher};
use std::net::Ipv6Addr;
use std::{fmt, str};
use columnar::{MonotonicallyMappableToU128, MonotonicallyMappableToU64};
use super::date_time_options::DATE_TIME_PRECISION_INDEXED;
use super::Field;
use crate::fastfield::FastValue;
use crate::schema::{Facet, Type};
use crate::DateTime;
/// Separates the different segments of a json path.
pub const JSON_PATH_SEGMENT_SEP: u8 = 1u8;
pub const JSON_PATH_SEGMENT_SEP_STR: &str =
unsafe { std::str::from_utf8_unchecked(&[JSON_PATH_SEGMENT_SEP]) };
/// Separates the json path and the value in
/// a JSON term binary representation.
pub const JSON_END_OF_PATH: u8 = 0u8;
/// Term represents the value that the token can take.
/// It's a serialized representation over different types.
///
/// It actually wraps a `Vec<u8>`. The first 5 bytes are metadata.
/// 4 bytes are the field id, and the last byte is the type.
///
/// The serialized value `ValueBytes` is considered everything after the 4 first bytes (term id).
#[derive(Clone)]
pub struct Term<B = Vec<u8>>(B)
where B: AsRef<[u8]>;
/// The number of bytes used as metadata by `Term`.
const TERM_METADATA_LENGTH: usize = 5;
impl Term {
/// Create a new Term with a buffer with a given capacity.
pub fn with_capacity(capacity: usize) -> Term {
let mut data = Vec::with_capacity(TERM_METADATA_LENGTH + capacity);
data.resize(TERM_METADATA_LENGTH, 0u8);
Term(data)
}
pub(crate) fn with_type_and_field(typ: Type, field: Field) -> Term {
let mut term = Self::with_capacity(8);
term.set_field_and_type(field, typ);
term
}
fn with_bytes_and_field_and_payload(typ: Type, field: Field, bytes: &[u8]) -> Term {
let mut term = Self::with_capacity(bytes.len());
term.set_field_and_type(field, typ);
term.0.extend_from_slice(bytes);
term
}
fn from_fast_value<T: FastValue>(field: Field, val: &T) -> Term {
let mut term = Self::with_type_and_field(T::to_type(), field);
term.set_u64(val.to_u64());
term
}
/// Panics when the term is not empty... ie: some value is set.
/// Use `clear_with_field_and_type` in that case.
///
/// Sets field and the type.
pub(crate) fn set_field_and_type(&mut self, field: Field, typ: Type) {
assert!(self.is_empty());
self.0[0..4].clone_from_slice(field.field_id().to_be_bytes().as_ref());
self.0[4] = typ.to_code();
}
/// Is empty if there are no value bytes.
pub fn is_empty(&self) -> bool {
self.0.len() == TERM_METADATA_LENGTH
}
/// Builds a term given a field, and a `Ipv6Addr`-value
pub fn from_field_ip_addr(field: Field, ip_addr: Ipv6Addr) -> Term {
let mut term = Self::with_type_and_field(Type::IpAddr, field);
term.set_ip_addr(ip_addr);
term
}
/// Builds a term given a field, and a `u64`-value
pub fn from_field_u64(field: Field, val: u64) -> Term {
Term::from_fast_value(field, &val)
}
/// Builds a term given a field, and a `i64`-value
pub fn from_field_i64(field: Field, val: i64) -> Term {
Term::from_fast_value(field, &val)
}
/// Builds a term given a field, and a `f64`-value
pub fn from_field_f64(field: Field, val: f64) -> Term {
Term::from_fast_value(field, &val)
}
/// Builds a term given a field, and a `bool`-value
pub fn from_field_bool(field: Field, val: bool) -> Term {
Term::from_fast_value(field, &val)
}
/// Builds a term given a field, and a `DateTime` value
pub fn from_field_date(field: Field, val: DateTime) -> Term {
Term::from_fast_value(field, &val.truncate(DATE_TIME_PRECISION_INDEXED))
}
/// Creates a `Term` given a facet.
pub fn from_facet(field: Field, facet: &Facet) -> Term {
let facet_encoded_str = facet.encoded_str();
Term::with_bytes_and_field_and_payload(Type::Facet, field, facet_encoded_str.as_bytes())
}
/// Builds a term given a field, and a string value
pub fn from_field_text(field: Field, text: &str) -> Term {
Term::with_bytes_and_field_and_payload(Type::Str, field, text.as_bytes())
}
/// Builds a term bytes.
pub fn from_field_bytes(field: Field, bytes: &[u8]) -> Term {
Term::with_bytes_and_field_and_payload(Type::Bytes, field, bytes)
}
/// Removes the value_bytes and set the field and type code.
pub(crate) fn clear_with_field_and_type(&mut self, typ: Type, field: Field) {
self.truncate_value_bytes(0);
self.set_field_and_type(field, typ);
}
/// Removes the value_bytes and set the type code.
pub fn clear_with_type(&mut self, typ: Type) {
self.truncate_value_bytes(0);
self.0[4] = typ.to_code();
}
/// Sets a u64 value in the term.
///
/// U64 are serialized using (8-byte) BigEndian
/// representation.
/// The use of BigEndian has the benefit of preserving
/// the natural order of the values.
pub fn set_u64(&mut self, val: u64) {
self.set_fast_value(val);
}
/// Sets a `i64` value in the term.
pub fn set_i64(&mut self, val: i64) {
self.set_fast_value(val);
}
/// Sets a `DateTime` value in the term.
pub fn set_date(&mut self, date: DateTime) {
self.set_fast_value(date);
}
/// Sets a `f64` value in the term.
pub fn set_f64(&mut self, val: f64) {
self.set_fast_value(val);
}
/// Sets a `bool` value in the term.
pub fn set_bool(&mut self, val: bool) {
self.set_fast_value(val);
}
fn set_fast_value<T: FastValue>(&mut self, val: T) {
self.set_bytes(val.to_u64().to_be_bytes().as_ref());
}
pub(crate) fn append_type_and_fast_value<T: FastValue>(&mut self, val: T) {
self.0.push(T::to_type().to_code());
let value = if T::to_type() == Type::Date {
DateTime::from_u64(val.to_u64())
.truncate(DATE_TIME_PRECISION_INDEXED)
.to_u64()
} else {
val.to_u64()
};
self.0.extend(value.to_be_bytes().as_ref());
}
/// Sets a `Ipv6Addr` value in the term.
pub fn set_ip_addr(&mut self, val: Ipv6Addr) {
self.set_bytes(val.to_u128().to_be_bytes().as_ref());
}
/// Sets the value of a `Bytes` field.
pub fn set_bytes(&mut self, bytes: &[u8]) {
self.truncate_value_bytes(0);
self.0.extend(bytes);
}
/// Set the texts only, keeping the field untouched.
pub fn set_text(&mut self, text: &str) {
self.set_bytes(text.as_bytes());
}
/// Truncates the value bytes of the term. Value and field type stays the same.
pub fn truncate_value_bytes(&mut self, len: usize) {
self.0.truncate(len + TERM_METADATA_LENGTH);
}
/// The length of the bytes.
pub fn len_bytes(&self) -> usize {
self.0.len() - TERM_METADATA_LENGTH
}
/// Appends value bytes to the Term.
///
/// This function returns the segment that has just been added.
#[inline]
pub fn append_bytes(&mut self, bytes: &[u8]) -> &mut [u8] {
let len_before = self.0.len();
self.0.extend_from_slice(bytes);
&mut self.0[len_before..]
}
/// Appends json path bytes to the Term.
/// If the path contains 0 bytes, they are replaced by a "0" string.
/// The 0 byte is used to mark the end of the path.
///
/// This function returns the segment that has just been added.
#[inline]
pub fn append_path(&mut self, bytes: &[u8]) -> &mut [u8] {
let len_before = self.0.len();
if bytes.contains(&0u8) {
self.0
.extend(bytes.iter().map(|&b| if b == 0 { b'0' } else { b }));
} else {
self.0.extend_from_slice(bytes);
}
&mut self.0[len_before..]
}
/// Appends a JSON_PATH_SEGMENT_SEP to the term.
/// Only used for JSON type.
#[inline]
pub fn add_json_path_separator(&mut self) {
self.0.push(JSON_PATH_SEGMENT_SEP);
}
/// Sets the current end to JSON_END_OF_PATH.
/// Only used for JSON type.
#[inline]
pub fn set_json_path_end(&mut self) {
let buffer_len = self.0.len();
self.0[buffer_len - 1] = JSON_END_OF_PATH;
}
/// Sets the current end to JSON_PATH_SEGMENT_SEP.
/// Only used for JSON type.
#[inline]
pub fn set_json_path_separator(&mut self) {
let buffer_len = self.0.len();
self.0[buffer_len - 1] = JSON_PATH_SEGMENT_SEP;
}
}
impl<B> Term<B>
where B: AsRef<[u8]>
{
/// Wraps a object holding bytes
pub fn wrap(data: B) -> Term<B> {
Term(data)
}
/// Return the type of the term.
pub fn typ(&self) -> Type {
self.value().typ()
}
/// Returns the field.
pub fn field(&self) -> Field {
let field_id_bytes: [u8; 4] = (&self.0.as_ref()[..4]).try_into().unwrap();
Field::from_field_id(u32::from_be_bytes(field_id_bytes))
}
/// Returns the serialized representation of the value.
/// (this does neither include the field id nor the value type.)
///
/// If the term is a string, its value is utf-8 encoded.
/// If the term is a u64, its value is encoded according
/// to `byteorder::BigEndian`.
pub fn serialized_value_bytes(&self) -> &[u8] {
&self.0.as_ref()[TERM_METADATA_LENGTH..]
}
/// Returns the value of the term.
/// address or JSON path + value. (this does not include the field.)
pub fn value(&self) -> ValueBytes<&[u8]> {
ValueBytes::wrap(&self.0.as_ref()[4..])
}
/// Returns the serialized representation of Term.
/// This includes field_id, value type and value.
///
/// Do NOT rely on this byte representation in the index.
/// This value is likely to change in the future.
#[inline]
pub fn serialized_term(&self) -> &[u8] {
self.0.as_ref()
}
}
/// ValueBytes represents a serialized value.
/// The value can be of any type of [`Type`] (e.g. string, u64, f64, bool, date, JSON).
/// The serialized representation matches the lexographical order of the type.
///
/// The `ValueBytes` format is as follow:
/// `[type code: u8][serialized value]`
///
/// For JSON `ValueBytes` equals to:
/// `[type code=JSON][JSON path][JSON_END_OF_PATH][ValueBytes]`
///
/// The nested ValueBytes in JSON is never of type JSON. (there's no recursion)
#[derive(Clone)]
pub struct ValueBytes<B>(B)
where B: AsRef<[u8]>;
impl<B> ValueBytes<B>
where B: AsRef<[u8]>
{
/// Wraps a object holding bytes
pub fn wrap(data: B) -> ValueBytes<B> {
ValueBytes(data)
}
fn typ_code(&self) -> u8 {
self.0.as_ref()[0]
}
/// Return the type of the term.
pub fn typ(&self) -> Type {
Type::from_code(self.typ_code()).expect("The term has an invalid type code")
}
/// Returns the `u64` value stored in a term.
///
/// Returns `None` if the term is not of the u64 type, or if the term byte representation
/// is invalid.
pub fn as_u64(&self) -> Option<u64> {
self.get_fast_type::<u64>()
}
fn get_fast_type<T: FastValue>(&self) -> Option<T> {
if self.typ() != T::to_type() {
return None;
}
let value_bytes = self.value_bytes();
let value_u64 = u64::from_be_bytes(value_bytes.try_into().ok()?);
Some(T::from_u64(value_u64))
}
/// Returns the `i64` value stored in a term.
///
/// Returns `None` if the term is not of the i64 type, or if the term byte representation
/// is invalid.
pub fn as_i64(&self) -> Option<i64> {
self.get_fast_type::<i64>()
}
/// Returns the `f64` value stored in a term.
///
/// Returns `None` if the term is not of the f64 type, or if the term byte representation
/// is invalid.
pub fn as_f64(&self) -> Option<f64> {
self.get_fast_type::<f64>()
}
/// Returns the `bool` value stored in a term.
///
/// Returns `None` if the term is not of the bool type, or if the term byte representation
/// is invalid.
pub fn as_bool(&self) -> Option<bool> {
self.get_fast_type::<bool>()
}
/// Returns the `Date` value stored in a term.
///
/// Returns `None` if the term is not of the Date type, or if the term byte representation
/// is invalid.
pub fn as_date(&self) -> Option<DateTime> {
self.get_fast_type::<DateTime>()
}
/// Returns the text associated with the term.
///
/// Returns `None` if the field is not of string type
/// or if the bytes are not valid utf-8.
pub fn as_str(&self) -> Option<&str> {
if self.typ() != Type::Str {
return None;
}
str::from_utf8(self.value_bytes()).ok()
}
/// Returns the facet associated with the term.
///
/// Returns `None` if the field is not of facet type
/// or if the bytes are not valid utf-8.
pub fn as_facet(&self) -> Option<Facet> {
if self.typ() != Type::Facet {
return None;
}
let facet_encode_str = str::from_utf8(self.value_bytes()).ok()?;
Some(Facet::from_encoded_string(facet_encode_str.to_string()))
}
/// Returns the bytes associated with the term.
///
/// Returns `None` if the field is not of bytes type.
pub fn as_bytes(&self) -> Option<&[u8]> {
if self.typ() != Type::Bytes {
return None;
}
Some(self.value_bytes())
}
/// Returns a `Ipv6Addr` value from the term.
pub fn as_ip_addr(&self) -> Option<Ipv6Addr> {
if self.typ() != Type::IpAddr {
return None;
}
let ip_u128 = u128::from_be_bytes(self.value_bytes().try_into().ok()?);
Some(Ipv6Addr::from_u128(ip_u128))
}
/// Returns the json path type.
///
/// Returns `None` if the value is not JSON.
pub fn json_path_type(&self) -> Option<Type> {
let json_value_bytes = self.as_json_value_bytes()?;
Some(json_value_bytes.typ())
}
/// Returns the json path bytes (including the JSON_END_OF_PATH byte),
/// and the encoded ValueBytes after the json path.
///
/// Returns `None` if the value is not JSON.
pub(crate) fn as_json(&self) -> Option<(&[u8], ValueBytes<&[u8]>)> {
if self.typ() != Type::Json {
return None;
}
let bytes = self.value_bytes();
let pos = bytes.iter().cloned().position(|b| b == JSON_END_OF_PATH)?;
// split at pos + 1, so that json_path_bytes includes the JSON_END_OF_PATH byte.
let (json_path_bytes, term) = bytes.split_at(pos + 1);
Some((json_path_bytes, ValueBytes::wrap(term)))
}
/// Returns the encoded ValueBytes after the json path.
///
/// Returns `None` if the value is not JSON.
pub(crate) fn as_json_value_bytes(&self) -> Option<ValueBytes<&[u8]>> {
if self.typ() != Type::Json {
return None;
}
let bytes = self.value_bytes();
let pos = bytes.iter().cloned().position(|b| b == JSON_END_OF_PATH)?;
Some(ValueBytes::wrap(&bytes[pos + 1..]))
}
/// Returns the serialized value of ValueBytes without the type.
fn value_bytes(&self) -> &[u8] {
&self.0.as_ref()[1..]
}
/// Returns the serialized representation of Term.
///
/// Do NOT rely on this byte representation in the index.
/// This value is likely to change in the future.
pub fn as_serialized(&self) -> &[u8] {
self.0.as_ref()
}
fn debug_value_bytes(&self, f: &mut fmt::Formatter) -> fmt::Result {
let typ = self.typ();
write!(f, "type={typ:?}, ")?;
match typ {
Type::Str => {
let s = self.as_str();
write_opt(f, s)?;
}
Type::U64 => {
write_opt(f, self.as_u64())?;
}
Type::I64 => {
write_opt(f, self.as_i64())?;
}
Type::F64 => {
write_opt(f, self.as_f64())?;
}
Type::Bool => {
write_opt(f, self.as_bool())?;
}
// TODO pretty print these types too.
Type::Date => {
write_opt(f, self.as_date())?;
}
Type::Facet => {
write_opt(f, self.as_facet())?;
}
Type::Bytes => {
write_opt(f, self.as_bytes())?;
}
Type::Json => {
if let Some((path_bytes, sub_value_bytes)) = self.as_json() {
// Remove the JSON_END_OF_PATH byte & convert to utf8.
let path = str::from_utf8(&path_bytes[..path_bytes.len() - 1])
.map_err(|_| std::fmt::Error)?;
let path_pretty = path.replace(JSON_PATH_SEGMENT_SEP_STR, ".");
write!(f, "path={path_pretty}, ")?;
sub_value_bytes.debug_value_bytes(f)?;
}
}
Type::IpAddr => {
write_opt(f, self.as_ip_addr())?;
}
}
Ok(())
}
}
impl<B> Ord for Term<B>
where B: AsRef<[u8]>
{
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.serialized_term().cmp(other.serialized_term())
}
}
impl<B> PartialOrd for Term<B>
where B: AsRef<[u8]>
{
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl<B> PartialEq for Term<B>
where B: AsRef<[u8]>
{
fn eq(&self, other: &Self) -> bool {
self.serialized_term() == other.serialized_term()
}
}
impl<B> Eq for Term<B> where B: AsRef<[u8]> {}
impl<B> Hash for Term<B>
where B: AsRef<[u8]>
{
fn hash<H: Hasher>(&self, state: &mut H) {
self.0.as_ref().hash(state)
}
}
fn write_opt<T: std::fmt::Debug>(f: &mut fmt::Formatter, val_opt: Option<T>) -> fmt::Result {
if let Some(val) = val_opt {
write!(f, "{val:?}")?;
}
Ok(())
}
impl<B> fmt::Debug for Term<B>
where B: AsRef<[u8]>
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let field_id = self.field().field_id();
write!(f, "Term(field={field_id}, ")?;
let value_bytes = ValueBytes::wrap(&self.0.as_ref()[4..]);
value_bytes.debug_value_bytes(f)?;
write!(f, ")",)?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use crate::schema::*;
#[test]
pub fn test_term_str() {
let mut schema_builder = Schema::builder();
schema_builder.add_text_field("text", STRING);
let title_field = schema_builder.add_text_field("title", STRING);
let term = Term::from_field_text(title_field, "test");
assert_eq!(term.field(), title_field);
assert_eq!(term.typ(), Type::Str);
assert_eq!(term.value().as_str(), Some("test"))
}
/// Size (in bytes) of the buffer of a fast value (u64, i64, f64, or date) term.
/// <field> + <type byte> + <value len>
///
/// - <field> is a big endian encoded u32 field id
/// - <type_byte>'s most significant bit expresses whether the term is a json term or not
/// The remaining 7 bits are used to encode the type of the value.
/// If this is a JSON term, the type is the type of the leaf of the json.
///
/// - <value> is, if this is not the json term, a binary representation specific to the type.
/// If it is a JSON Term, then it is prepended with the path that leads to this leaf value.
const FAST_VALUE_TERM_LEN: usize = 4 + 1 + 8;
#[test]
pub fn test_term_u64() {
let mut schema_builder = Schema::builder();
let count_field = schema_builder.add_u64_field("count", INDEXED);
let term = Term::from_field_u64(count_field, 983u64);
assert_eq!(term.field(), count_field);
assert_eq!(term.typ(), Type::U64);
assert_eq!(term.serialized_term().len(), FAST_VALUE_TERM_LEN);
assert_eq!(term.value().as_u64(), Some(983u64))
}
#[test]
pub fn test_term_bool() {
let mut schema_builder = Schema::builder();
let bool_field = schema_builder.add_bool_field("bool", INDEXED);
let term = Term::from_field_bool(bool_field, true);
assert_eq!(term.field(), bool_field);
assert_eq!(term.typ(), Type::Bool);
assert_eq!(term.serialized_term().len(), FAST_VALUE_TERM_LEN);
assert_eq!(term.value().as_bool(), Some(true))
}
}